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SPX1121
150mA Low Dropout Voltage Regulator
FEATURES 5.0V and 3.3V output versions 1% Output Accuracy Very Low Quiescent Current Low Dropout: 300mV @ 150mA Very Tight Load & Line Regulation Very Low Temperature Coefficient Current and Thermal Limiting Requires only 1F for Stability Equivalent Replacement for LT1121 Industry Standard SOT-223 and TO-92 3 lead packages
VIN
IIN
IN
OUT
5V IL
SPX1121
+ 0.1F GND + 2.2F
LOAD
IIN= I L+ I G
IG
Figure 1. Fixed +5V Regulator Circuit
DESCRIPTION The SPX1121 is a low power voltage regulator. It is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX1121 features very low quiescent current and low dropout voltage (typ. 20mV at 100A and 300mV at 150mA). A tight initial tolerance (1%), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/C typ.), make the SPX1121 useful as a low power voltage reference. PACKAGE PINOUOTS
SOT-223 Package (M3)
TO-92 (N) 1 2 3
GND SPX1121
1 2 3
INPUT
OUTPUT GND
VIN GND VOUT Front View
Bottom View
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation........................................Internally Limited Lead Temperature (soldering, 5 seconds) ................260C Storage Temperature Range........................-65C to +150C Operating Junction Temperature Range......-40C to +125C Input Supply Voltage...........................................-0.3V to +30V ESD Rating................................................................2kV min
ELECTRICAL CHARACTERISTICS
applies over the full operating temperature ranges.
VIN=6V, IL=100A, CL=1F (NOTE 2), T A= 25 C, unless otherwise specified. Boldface
PARAMETER 3.3 V Versions Output Voltage 5 V Versions Output Voltage All Voltage Options Output Voltage Temperature Coefficient Line Regulation (NOTE 3) Load Regulation (NOTE3) Dropout Voltage (NOTE 5)
CONDITIONS TJ=25C 1mA IL 150 mA TJ= 25 C 1 mA IL 150 mA (NOTE1) 6VVIN30V (NOTE4) 100 AIL150 mA IL= 100 A IL= 1mA IL= 100 mA IL= 150 mA IL= 100 A IL= 1mA IL= 10mA IL= 50mA IL= 100 mA IL= 150 mA VOUT= 0 CL= 1 F CL= 200 F
MIN. 3.267 3.217 4.950 4.880
TYP. 3.300 3.300 5.000 5.000 20 0.03 0.04 20 110 270 300 100 110 350 1 3 5 230 0.05 430 160 62.3 131.9
MAX 3.333 3.382 5.050 5.120 100 0.20 0.60
UNIT V
V
ppm/ C % % mV
Ground Current
550 170
A
mA 6 10 500 0.20
Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz Thermal Resistance Oja SOT-223-3 TO-92-3
mA %/W V rms V rms C/W C/W
NOTE1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. NOTE2: Unless otherwise specified all limits guaranteed for T J= 25 C, VIN= 6V, I L= 100 A and CL= 1 F. NOTE3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. NOTE4: Line regulation for the SPX1121 is tested at I L= 1mA. For T J= 125 C, line regulation is guaranteed by design. See typical performance characteristics for line regulation versus temperature and load current. NOTE5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential.
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
6 5
OUTPUT VOLTAGE (VOLTS) INPUT CURRENT (A)
250 225
R L = 50k
GROUND PIN CURRENT (mA)
10
200 175 150 125 100 75 50 25 0 0 1 2 3 4 5 6 0 1 2 3 4 5 6 7 8 9 10
INPUT VOLTAGE (VOLTS) RL =
8
4
R L =50k
1
3
R L =50k
2 1 0
INPUT VOLTAGE (VOLTS)
0.1
0.01 0.1
1
10
100
LOAD CURRENT (mA)
Dropout Characteristics
Input Current
Ground Current vs. Load Current
320 280
GROUND CURRENT (A) INPUT CURRENT (mA)
240 200 160
IL= 0 I L = 1mA
120 80 40 0 0 1 2 3 4 5 6 7 8
160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6
6
GROUND CURRENT (mA)
R L =50 VOUT = 5V
5
V IN = 6V I L = 100mA
4
3 7 8 9 10 -75 -50 -25 0 25 50 75 100 125 150
TEMPERATURE (C)
INPUT VOLTAGE (VOLTS)
INPUT VOLTAGE (VOLTS)
Ground Current vs. Input Voltage
8 7
Input Current
190
Ground Current
QUIESCENT CURRENT (A)
GROUND CURRENT (mA)
6
I L =100mA
170
V IN =6V I L =100uA
5 4 3 2 1 0 0 1 2 3 4 5 6 7 8
150
130
-75 -50 -25
0
25 50
75 100 125 150
INPUT VOLTAGE
TEMPERATURE (C)
Ground Current
Quiescent Current
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
3
TYPICAL PERFORMANCE CHARACTERISTICS
500
I L = 150mA
500
240 230
SHORT CIRCUIT CURRENT (mA)
400
DROP-OUT VOLTAGE (mV) DROP-OUT VOLTAGE (mV)
400
220 210 200 190 180 170 -75 -50 -25
300 200
~ ~
300
200
TJ = 25C
40 20 0 -75 -50 -25 0 25 50 75 100 125 150
I L = 100 A
100 0 100A 1mA 10mA 100mA
0
25 50
75 100 125 150
TEMPERATURE (C)
OUTPUT CURRENT
TEMPERATURE (C)
Drop-Out Voltage
100 mV 50 mV
INPUT OUTPUT VOLTAGE VOLTAGE CHANGE
Drop-Out Voltage
10
IO = 100 A
Short Circuit Current
90 80
RIPPLE REJECTION (dB)
OUTPUT IMPEDANCE (OHMS)
5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 10 100 1K 10K 100K 1M
V OUT = 5V C L = 1 F I O = 1mA I O = 100mA
70
IL= 0
0 -50 mV ~ ~ 8V 6V 4V 0 200 400
TIME(s) C L = 1 F I L = 1mA V OUT = 5V
60 50 40 30 20 10 1 10 2 10 3 10 4 10 5 10 6
C L = 1 F V IN = 6V V OUT = 5V I L = 100 A
600
800
FREQUENCY (Hz)
FREQUENCY (Hz)
Line Transient Response
90 80
RIPPLE REJECTION (dB)
C L = 1F V IN = 6V V OUT = 5V
Output Impedance
80
I L = 50mA
Ripple Rejection
2.3
70
RIPPLE REJECTION (dB)
70 60 50 40 30 20 10 1
I L = 1mA
60 50 40 30 20
I L = 100mA
MINIMUM OPERATING VOLTAGE (V)
2.1
C L = 1F V IN = 6V V OUT = 5V
1.9
I L = 10mA
10
10 2
10 3
10 4
10 5
10 6
10 1
10 2
10 3
10 4
10 5
10 6
1.7 -75
-50 -25
0
25
50
75 100 125 150
FREQUENCY (Hz)
FREQUENCY (Hz)
TEMPERATURE
Ripple Rejection
Ripple Rejection
Minimum Operating Voltage
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
4
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
250 200 150
LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV) LOAD OUTPUT VOLTAGE CURRENT CHANGE (mV)
80 60 40
OUTPUT CURRENT (mA)
120 100 80 60 40 20 0 0 4 8 12 16 20 0 5 10 15 20 25 30
TIME (ms) INPUT VOLTAGE (V) T A = 85 C TO-92 PACKAGE 0.25" LEADS SOLDERED TO PC BOARD Vout=5V T JMAX = 125 C
100 50 0 -50 -100
~ ~ C L = 1 F V OUT = 5V
20 0 -20 -40 -60
~ ~ C L = 10F V OUT = 5V
T A =25 C
100
A
mA
100 100
100 0 1 2
TIME (ms)
A A
3
4
5
Load Transient Response
Load Transient Response
Maxium Rated Output
30 5
OUTPUT VOLTAGE CHANGE (mV) OUTPUT VOLTAGE CHANGE (mV)
4 2 0 -2
25 20 15 10 5 0 ~ ~ 10 5 0 -5 -10 5 10 15 20
T J = 125 C T J = 150 C
I L = 100A
I L = 1mA
POWER DISSIPATION (W)
~ ~ 1
1.25W
I L = 100A
0 -1 0 10 20 30 40 50
TIME (s)
25
30
INPUT VOLTAGE (V)
Thermal Response
Line Regulation
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
5
APPLICATIONS HINTS EXTERNAL CAPACITORS The stability of the SPX1121 requires a 1F or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic works fine here. For operations below 25C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30C. The ESR of about 5 or less and resonant frequency above 500kHz are the most important parameters in the value of the capacitor. The capacitors value may be increased without limit. The SPX1121 unlike other low dropout regulators will remain stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive. If there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input then a 0.1F tantalum or aluminum electrolytic capacitor should be placed from the input to the ground.
REDUCING OUTPUT NOISE It may be an advantage to reduce the AC noise present at the output. One way is to reduce the regulator bandwidth by increasing the size of the output capacitor. Increasing the capacitor from 1F to 220 F decreases the noise from 430V to 160VRMS for a 100kHz bandwidth at 5V output.
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
6
PACKAGE: 3 PIN SOT-223
D b2
E E1
1
2
3
e e1
TOP VIEW
b
Gauge Plane A L2 o L Seating Plane
A2
A1
c
FRONT VIEW
3 Pin SOT-223
JEDEC TO-261
Variation AA Inches Conversion Factor: 1 Inch = 25.40 mm NOM MAX 0.071 0.004 0.063 0.067 0.030 0.033 0.118 0.122 0.012 0.014 0.256 0.264 0.276 0.287 0.138 0.146 0.091 BASIC 0.182 BASIC 0.030 0.010 BASIC 0... 10... JL Aug8-05/Rev A
(c) Copyright 2005 Sipex Corporation
Millimeters Controlling Dimension SYMBOL MIN NOM A A1 0.02 A2 1.50 1.60 b 0.66 0.76 b2 2.90 3.00 c 0.23 0.30 D 6.30 6.50 E 6.70 7.00 E1 3.30 3.50 e 2.30 BASIC e1 4.60 BASIC L 0.75 L2 0.25 BASIC o 0... SIPEX Pkg Signoff Date/Rev:
Date: 12/20/05
MAX 1.80 0.10 1.70 0.84 3.10 0.35 6.70 7.30 3.70
MIN 0.001 0.060 0.026 0.114 0.010 0.248 0.264 0.130
10...
SPX1121 150mA Low DropoutVoltage Regulator
7
PACKAGE: 3 PIN TO-92
L e e1 W
D
A
b
S1
R
E
a(2x)
3 Pin
SYMBOL Dimensions in Inches: Controlling Dimension MIN 0.170 0.014 0.130 0.095 0.045 0.500 0.085 0.045 0.016 0.175 4... NOM -
TO-92
Dimensions in Millimeters Conversion Factor: 1 Inch = 25.40 mm MIN 4.32 0.36 3.30 2.41 1.14 12.70 2.16 1.14 0.41 4.45 4... NOM MAX 4.95 0.51 3.94 2.67 1.40 15.49 2.41 1.52 0.56 4.95 6...
(c) Copyright 2005 Sipex Corporation
A b E e e1 L R S1 W D
MAX 0.195 0.020 0.155 0.105 0.055 0.610 0.095 0.060 0.022 0.195 6...
SIPEX Pkg Signoff Date/Rev:
Date: 12/20/05
JL Sept23-05 / RevA
SPX1121 150mA Low DropoutVoltage Regulator
8
ORDERING INFORMATION PART NUMBER ACCURACY OUTPUT VOLTAGE SPX1121N-3-3 ...................... 1% .................... 3.3V ................... SPX1121N-3-3/TR ................ 1% .................... 3.3V ................... SPX1121N-5-0 ...................... 1% .................... 5.0V ................... SPX1121N-5-0/TR ................ 1% .................... 5.0V ................... SPX1121M3-3-3 .................... 1% .................... 3.3V ................... SPX1121M3-3-3/TR .............. 1% .................... 3.3V ................... SPX1121M3-5-0 .................... 1% .................... 5.0V ................... SPX1121M3-5-0/TR .............. 1% .................... 5.0V ...................
Available in lead free packaging. To order add "-L" suffix to part number. Example: SPX1121N-3.3/TR = standard; SPX1121N-L-3.3/TR = lead free /TR = Tape and Reel Pack quantity is 2500 for or SOT-223 and 2,000 for TO-92.
PACKAGE 3 lead TO-92 3 lead TO-92 3 lead TO-92 3 lead TO-92 3 lead SOT-223 3 lead SOT-223 3 lead SOT-223 3 lead SOT-223
Corporation
ANALOG EXCELLENCE
Sipex Corporation Headquarters and Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Date: 12/20/05
SPX1121 150mA Low DropoutVoltage Regulator
(c) Copyright 2005 Sipex Corporation
9

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